Another Battlestar Galactica star is set to join the eighth season of 24, but unlike Katee--who joins the show as a systems analyst for the revived CTU--this one appears on the other side of the fence. Callum Keith Rennie, who played Cylon infiltrator Leoben Conoy, will play Russian syndicate mobster Vladimir Laitanan.

"We love this actor," executive producer Brannon Braga told TV Guide Magazine, adding that the character is expected to debut in the sixth or seventh episode of season 8, which premieres in January next year.

It's another villainous role for Rennie, after being one of the murderers in CBS' Harper's Island. The one-time Californication cast member is set to join 24 season 8's other confirmed villain, German actor Jurgen Prochnow, who joins as Bazhaev, a member of an Eastern European syndicate.